1. What is the relative rate of effusion of CO and CO2?
A. CO is 1.25 times faster than CO2
B. CO is 3.75 times faster than CO2
C. CO is 1.25 times faster than CO
D. Both diffuse at the same rate
✅ The correct answer is option A.
Gases MCQs
2. Which of these gases diffuse more quickly than oxygen?
A. H2S
B. NO
C. Cl2
D. N2O
✅ The correct answer is option B.
3. Which of the following is not considered as an intermolecular force between molecules?
A. Coordinate covalent bonds
B. Hydrogen bonds
C. Debye forces
D. London dispersion forces
✅ The correct answer is option A.
4. The weakest (in strength) of the following intermolecular forces is
A. Hydrogen bonding
B. Vander Waals force
C. Forces among the polar molecules
D. Ionic bond
✅ The correct answer is option B.
5. Ideal gasses have all the following characteristics except.
A. The absence of intermolecular forces
B. Collisions among the molecules of an ideal gas are perfectly elastic
C. The molecules occupy no space
D. All of the above are correct
✅ The correct answer is option C.
6. Which of the following statements is true about plasma
A. It may be the first state of matter
B. It is not a phase transition
C. It is a conductor of electricity
D. All of the above
✅ The correct answer is option D.
8. Under what conditions the gases deviate from the ideal behaviour?
A. High-temperature
B. Low temperature
C. High-pressure
D. B and C
✅ The correct answer is option D.
9. Which one has the lowest density at room temperature?
A. Ne
B. N2
C. NH3
D. CO
✅ The correct answer is option C.
10. The introduction of the Kelvin scale in thermometry is according to
A. Boyles law
B. Charles law
C. Daltons law
D. Grahams law
✅ The correct answer is option B.